Netix it could be the way your hormones are while feeding bub. Some women get a temporary condition where the thyroid is not producing the right a amount of hormones. Usually nothing serious and most women don't even realise it's happening and often goes away by itself (had it with my first 2 babies)

1) Do you also feel tired most of the time (sounds like a silly question when you have a young baby, I know) tired even when you get a decent sleep?
2) Any unexplained weight gain? (hard to tell when baby is newborn)

If you are worried (or if the example sounds like you) ask your doctor to do a Thyroid Function Test (TFT)


Also if you are worried about baby over heating in bed with you maybe try dressing him in a lighter bodysuit, like a short sleeve suit or something. I had to do that with DS2 as he is a little hotbody and would sweat anytime.